Can-end closure.



A. ALVAREZ.

CAN END CLOSURE.

APPLICATION FILED SEPT. a, 1913.

1,220,15 1. Patented Mar. 20, 1917.

amaze-5" INVENTOI? fi /ym ggggm A TTOR/VEY UNITED STATES PATENT OFFICE.

ANTONIO ALVAREZ, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO AMERICAN CAN COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF NEW JERSEY.

CAN -END CLOSURE.

I Specification of Letters Patent- Patented Mar. 20, 1917.

Application filed September 3, 1913. Serial No. 787,897.

To all whom it mag concern:

Be it known that I, ANTONIO AnvARnz, citizen of the United States, residing in the city and county of San Francisco and State of California, have invented certain new and useful Improvements in Can-End Closures, of which the following is a speci-' sealed, until such time as opened for the removal of the contents, the typepf packages employed for this purpose being those wherein one end of the cylindrical structure is permanently united thereto prior to the placing of the contents therein.

The present manner of closin the top .open end of such class of cylindrical struc tures, prior to being filled with the article to be sealed and transported, is to apply what may be termed a friction disk seal to open the end thereof and to positively unite the seal to the end of the can body, or cylindrical container, during the operation of double seaming the friction ring to the flanged end of the can body. In practice, it has been proven that this manner of uniting the friction disk seal, which is composed of cardboard, paper, tin foil, or a combination thereof, or even light metal, tends to break or mutilate the peripheral edge of the disk during the process of double seaming the friction ring to the cylindrical body, with the result that air is admitted to the interior of the container, and in the case of coffee tends to cause the deterioration there-' of. The object of the present invention is to so unite the friction disk seal to the body of the container for closing its open end as not to inturn the peripheral edge thereof during the double seaming process, thus leaving the friction disk seal, while firmly held to the cylindrical body for the formation of an air-tight joint, still free of the union with the double seamed joint between the friction ring and the flanged end thereof.

To comprehend the invention, reference should be had to the accompanying set of drawings, wherein Figure 1 1s a vertical sectional view of a container with the disk seal applied thereto and the friction ring double seamed to the end of the can body, andillustrating the position of the friction cap relative to the friction ring.

Fig. 2 is a broken perspective view of the container with the disk seal. and friction ring applied thereto.

Fig. 3 is an enlarged detail broken view taken on line a:-mFig. 1 of the drawings.

Fig. 4 is a similar view, disclosing the po-, sition of the friction ring prior to being double seamed to the flanged end of'the container body.

In the drawings the numeral 1 is used to indicate the body of the cylindrical container, which in the present case partakes of the form of a metallic can body, havin double seamed to the lower end thereo,

after having been filled, the bottom 2. At

its upper or top open end, the can body is outwardly flanged circumferentially, and within the interior of the said cylindrical body adjacent the upper'flanged end thereof is formed a circumferential shoulder 4,

which, in the present case, is provided by an annular groove 5, formed on the exterior of the said cylindrical body adjacent its upper flanged end. The circumferential interiorly disposed shoulder 4 provides a seat for the reception of the disk seal 6, which, in the present case, is formed of a piece of cardboard or other heavy material of a circumference equal to the interior circumference of the unflanged portion of the can body above the shoulder 4, which shoulder supports and upholds the said disk seal.

It will be understood that the disk seal may be composed of any suitable material adapted for the sealing of the open top end of the can body, as, for instance, tin foil or light tin, but,'preference is given to the employment of cardboard for the formation of the said disk.

The disk seal is held in place relative to the shoulder 4 by means of the friction ring 7, the same being provided with a downwardly extended circumferential shoulder 8, and an outwardly extended circumferential flange 9. This flange projects a slight distance beyond the outwardly flanged'end 3 of the can body and is united-thereto by the inturning thereof by the ordinary double seaming mechanism for the double seaming of the flange of the friction ring to the said outwardly flanged end of the can body for the formation of a hermetical joint. The depending circumferential shoulder 8 of this friction ring bearing firmly onto the circumferential edge of the disk seal seated on shoulder 24 of the can body, when the said friction disk is permanently united by the double seaming process to the outwardly flanged end of the said can body, serves to hold the said disk seal firmly in place and to provide a hermetical seal for the protection of the contents of the can. The friction ring, after being secured to the can body in the manner stated with the disk seal firmly held in place, is closed by means of the friction cap 10.

The disk seal is thus securely held and united to the top end portion of the can body without being tucked within the fold formed by the double seamed union between the flange of the friction ring and the said flanged end of the can body, and thus all liability of breakage or mutilation of the peripheral edge of the said sealed disk is obviated, which is an important feature in connection with the sealing of packages con taining coffee, or similar material, or those wherein it is desired to maintain the full strength and aromatic flavor of the article to be packed, or such as requires an air-tight container therefor.

It will be understood that the can body is closed by the ordinary side seamed joint 11, which is a feature in common with all packages of this character.

Having thus described the invention, what is claimed as new and desired to be protected by Letters Patent is 1. In a sealing closure for containers, the combination of a container body, a container end, and a disk seal held at its margin under sealing compression between the container body and container end exterior of the end seam, the said end being seamed to the body to thereby maintain such compression of the disk seal.

2. In a sealing closure for containers, in combination: a container body having a circumferential sealing seat at a distance within its mouth, and formed at its edge with a seaming flange; a container end having a discharge opening and formed with a circumferential surface fitting within the mouth of the body, a seaming flange seamed with the said flange of the body, and a bottom sealing shoulder which opposes and is located just above the saidcircumferential sealing seat; a disk seal arranged across the said opening of the container end below the same and having its edge resting on the said sealing seat of the body exterior of the end seam and compressed tightly and smoothly thereon by the shoulder of the container end; and a removable cover for the said opening of the container end.

In testimony whereof I have signed-my name to this specification in the presence of two subscribing witnesses.

ANTONIO ALVAREZ.

Witnesses:

N. A. ACKER, D. B. RICHARDS. 

